Self-cleaning trocar.



0. L. BUNN.

SELF CLEANING TEOOAR. APPLICATION FILED 001.25, 1909 Eatented May 24, 1910.

v sl a To all whom itmay concern:

Be it known that I, Onon L. Bonn, a citizen of the'United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Self-Cleaning Trocars, of which the following is a specification.

.This inventionrelates to trocars.

The object of the invention is to providean implement, of this character which shall be self-cleansing, that will not become clogged in use, and which may be employed by undertakers for relieving cavities of gases, for drawing blood by tapping the heart; by physicians for relieving dropsical cavities from water; and by veterinary surgeons in withdrawing water from around the lungs of animals.

A further object is to prowide a trocar which may bereadily ihserted and withdrawn without undue laceration, and in the use of which the operator will be protected from liability of infectiolrfrom withdrawn matter.

\Vith the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a troca'r, as will be hereinafter fully described and claimed.

In the accompanying drawings forming a part of this specification, and in which like characters of reference indicate corresponding parts: Figure 1. is a view in elevation of a. trocar constructed in accordance-with the present invention. Fig. 2 is a longitudinal sectional view, on an enlarged scale, of the implement, the same being broken away. Fig. 3 is a detail View of a portion of the implement.

Referring to the drawing. 1 designates the tube or cylinder and 2 the scraper or plunger. The entering end of the tube is beveled at a long angle to (its longitudinal axis to provide an entering point 3 which is sharp, and of. a contour to insure its ready insertion without dangeiu otnndue laceration, and the bore of the tube is of the same diameter throughout its entire-length, thus to insure easy passage of matter, the entering end being unobstructed, thus to obviate danger of clogging. At the end opposite UNITED STATES PA ENT carton.

ORON'L. BUNN, or PEORIA, ILLINors;

SELF-CLEANING rRooAI't.

Specification of Letters Patent Patented lIay 24, 1910, Application filed October 25, 1909. Serial Nb. 524,443; I

the point 3 the tube is provided with a stuffing box comprising a threaded nut 4 and a resilient gasket 8, the latter being designed snugly to embrace the rod 2, and thus prevent escape of any matter in the use of the device. The tube is provided with a branch 5, as is usual with such implements, to be engaged by a rubber tube for carrying off the matter withdrawn, and as this is Well u'nderstood,detailed illustration is deemed unnecessary.

The scraper or plunger, which constitutes one of the essential features of the invention, inasmuch as it secures the object of insuring free passage of matter through the tube and also of preventing'elogging, coinprises a rod having at one end a knurled finger-hold (3 and at its other end a cage 7,

comprising in this instance ifour members that are resilient in character and fit snugly the bore of the tube. As will be obvious the number of the members of the cage may be varied, and as such modification will be readily appreciated detailed illustration thereof is thought to be unnecessary. By the provision of the cage, when the trocar is inserted into a cavity, gaseous or..otherwise, free passage of liquid or the like will be insured upon withdrawing the plunger until the cage has passed the branch 5, and should the tube become clogged, it will only be necessary to reciprocate the plunger to remove obstructive nratter. It will be observed by reference to Fig. 2 that the entering point of the tube normally projects slightly beyond the cage, and this will iiisure 'a proper incision, with discharge of matter, without liability of clogging, inas much as the diameter of the plunger is relatively small as compared with the b-" e of the tube.

The improvements herei'n'defined, while compartively simple in construction, will cooperate in they presentation of a. thoroughly efficient implement, and one which will be entirely practical and thoroughly effective for the purposes designed.

Having thus described the invention, what is claimed as new, is

A trocar comprising a straight rigid tube having a-bore of thesame diameter throughout its length, and provided with atermi- Q: {A I 968,864

I Boint, the tube being provided with *a lateral escape of any septic m'atterin the use of the ranch to' be engaged by an ofi-take tube, device. n; -10 and at the end opposite the entering point In testimony whereof afiix my signature with 31 stuifin box, and a lunger provlded in presence of two witnesses. 5 with} eage ornied of-1'res1 ient membersto ORON L. BUNN.

enga'gmthe bore of 'the tube to clean the Witnesses: same, .thevshank ofiphe plunger being dis .R BE TZIMMERMAN umed. within the Stufiing box to prevent H. E. Holman; 

